late to the party... but i'm running a reba race on my niner mcr (XL size).
i love the bike, but the fork, i'm not entirely thrilled about. it gets the job done mostly, but it flexes (6'4", i was at 195 for a while, now finally back down to 180-185 after some riding). and after riding it for about a year, i think i'm going to run it into the ground this season and pick up something new at the end of the season.
i'm gonna try the fox out if it fits the bike and if they come in 80mm (i haven't looked into it much obviously)... but the one thing i hear about the fox is that it can feel a bit pogo-like on climbs, which i am not too entirely thrilled about hearing... but i can probably dial it in nice and stiff.